US2026045502A1PendingUtilityA1
Carbon material, negative electrode, secondary battery, and methods for production thereof
Est. expiryMar 13, 2043(~16.6 yrs left)· nominal 20-yr term from priority
C01P 2006/14C01P 2006/19C01P 2004/61C01P 2002/82C01P 2006/10C01P 2004/60C01B 32/21H01M 10/0525H01M 4/0404C01P 2006/40C01B 32/05C01B 32/00Y02E60/10H01M 2004/027H01M 2004/021H01M 10/058H01M 4/1393H01M 4/133H01M 4/587
67
PatentIndex Score
0
Cited by
0
References
0
Claims
Abstract
A carbon material has a volume-based average particle size d 50 of 9 μm or less, a true density of 2.25 g/cm 3 or less, and a Raman R value of 0.50 or less, the Raman R value being represented by the equation: {(intensity I B of peak P B near 1360 cm −1 in Raman spectrum analysis)/(intensity I A of peak P A near 1580 cm −1 in Raman spectrum analysis)}.
Claims
exact text as granted — not AI-modified1 . A carbon material having a volume-based average particle size d 50 of 9 μm or less, a true density of 2.25 g/cm 3 or less, and a Raman R value of 0.50 or less, the Raman R value being represented by an equation described below:
Raman
R
value
=
(
intensity
I
B
of
peak
P
B
near
1360
cm
-
1
in
Raman
spectrum
analysis
)
/
(
intensity
I
A
of
peak
P
A
near
1580
cm
-
1
in
Raman
spectrum
analysis
)
.
2 . The carbon material according to claim 1 , wherein the volume-based average particle size d 50 is 5 μm or more.
3 . The carbon material according to claim 1 , wherein the carbon material has a volume-based particle size d 90 of 15 μm or less, the volume-based particle size d 90 corresponding to cumulative 90% from a small particle side.
4 . The carbon material according to claim 1 , wherein the carbon material has a volume-based particle size d 10 of 6 μm or less, the volume-based particle size d 10 corresponding to cumulative 10% from a small particle side.
5 . The carbon material according to claim 1 , wherein the Raman R value is 0.20 or more.
6 . The carbon material according to claim 1 , wherein
the carbon material comprises an amorphous carbonaceous substance; and a ratio of a content (mass %) of the amorphous carbonaceous substance in the carbon material to the volume-based average particle size d 50 (μm) is 0.5 or more and 2.0 or less.
7 . The carbon material according to claim 1 , wherein the carbon material has a DBP oil absorption amount of 47 mL/100 g or less.
8 . The carbon material according to claim 1 , wherein the carbon material has a total pore volume of 0.58 mL/g or less.
9 . The carbon material according to claim 1 , wherein the carbon material has a cumulative pore volume of pores of 3000 nm or less of 0.3 mL/g or more.
10 . The carbon material according to claim 1 , wherein the carbon material has a cumulative pore volume of pores of 1000 nm or less of 0.1 mL/g or more.
11 . The carbon material according to claim 1 , wherein the carbon material has a cumulative pore volume of pores of from 10 nm to 50 nm of 0.01 mL/g or less.
12 . A negative electrode comprising the carbon material described in claim 1 .
13 . A non-aqueous secondary battery comprising a positive electrode and a negative electrode, the electrodes being capable of storing and releasing lithium ions, and an electrolyte, wherein
the negative electrode includes the carbon material described in claim 1 .
14 . A method for producing a carbon material, the method comprising:
mixing natural graphite having a volume-based average particle size d 50 of 9 μm or less and an amorphous carbonaceous substance precursor; and heating the mixture until a Raman R value represented by an equation described below reaches 0.50 or less, to produce a carbon material having a content of an amorphous carbonaceous substance in the carbon material of from 4 mass % to 15 mass %:
Raman
R
value
=
(
intensity
I
B
of
peak
P
B
near
1360
cm
-
1
in
Raman
spectrum
analysis
)
/
(
intensity
I
A
of
peak
P
A
near
1580
cm
-
1
in
Raman
spectrum
analysis
)
.
15 . The method for producing a carbon material according to claim 14 , wherein a temperature of the heating is 1200° C. or higher.
16 . The method for producing a carbon material according to claim 14 , wherein, after the carbon material is heated, the produced carbon material is disintegrated and classified.
17 . A method for producing a negative electrode, the method comprising applying the carbon material described in claim 1 onto a current collector.
18 . A method for producing a secondary battery including a positive electrode, a negative electrode, and an electrolyte, wherein
the negative electrode is produced by the method described in claim 17 .Join the waitlist — get patent alerts
Track US2026045502A1 — get alerts on status changes and closely related new filings.
We store only your email — no account needed. See our privacy policy.